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Pressure Gauges

Pressure Gauges

Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...

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Updated: Jul 2, 2026

Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases

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Simple sensitive capacitance manometer for corrosive gas laser systems.

S Shammas¹, H J Seguin

¹Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2G7.

The Review of Scientific Instruments

|February 1, 1979

Summary

This summary is machine-generated.

A novel capacitance manometer protects pressure gauges in corrosive laser gas environments. This inexpensive, easily fabricated device allows standard pressure sensors to be used in harsh chemical conditions.

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Area of Science:

Materials Science
Chemical Engineering
Instrumentation

Background:

Corrosive gases in laser environments pose a significant challenge to standard pressure measurement instruments.
Non-passivated pressure gauges are susceptible to degradation and failure when exposed to reactive gases.

Purpose of the Study:

To present the design and performance of a capacitance manometer.
To develop an affordable and easily manufacturable solution for pressure measurement in corrosive gas environments.
To enable the use of ordinary pressure gauges in systems with aggressive chemical compositions.

Main Methods:

Design of a capacitance manometer as an isolating device.
Fabrication of the device in a standard machine shop.
Testing the performance of the manometer in corrosive gas laser environments.

Main Results:

The capacitance manometer effectively isolates standard pressure gauges from corrosive gases.
The device is simple, inexpensive, and can be quickly fabricated.
Ordinary, non-passivated pressure measurement apparatus can be utilized in any gas system, regardless of corrosiveness.

Conclusions:

The developed capacitance manometer is a viable solution for pressure monitoring in challenging corrosive gas laser applications.
The design offers a cost-effective and accessible method to protect sensitive pressure instrumentation.
This innovation broadens the applicability of standard pressure gauges in diverse and aggressive chemical environments.